Dealer didn’t have the car bill

Moin dear biker, I wanted to buy another bike this week and actually conclude the purchase contract yesterday. However, the dealer noticed that he had not yet received the car ticket of the machine from the previous owner. According to the dealer, he wanted to unsubscribe the vehicle himself. He also contacted the previous owner and asked him to send the ticket as soon as possible. The dealer offered me 3 possibilities: 1. We wait until the ticket is there and closed 2. We conclude the contract and it documents in the contract that the bill is not available. Thus, I would be able to register the vehicle with the letter immediately and would receive a new bill at the time of registration. 3. Actually, like option 2, only that it documents that I had received the papers and I would claim that I had lost the bill at the time of registration. First, I decided on variant 1, since I did not rush anything where Have you ever bought a motorcycle, where the bill or generally the papers were no longer available? Did the registration really read off as problem-free as the dealer claimed to me? Or do you find the whole thing rather suspicious?